A Washington, D.C., watchdog group known for targeting Republicans now has Rep. Greg Walden, R-Ore., in its sights.

Citizens for Responsibility and Ethics in Washington filed a complaint Wednesday against Walden with the Office of Congressional Ethics for approving what the group called "fraudulent campaign fundraising websites" in his role as chairman of the National Republican Congressional Committee.

Walden and NRCC officials have defended the sites, saying it's obvious they are aimed at attacking Democrats.

In its complaint, Citizens for Responsibility and Ethics in Washington charged that the committee broke election law by using the names of Democrats on the websites without making clear the sites are in opposition to them. CREW also charged that it was appropriate to file an ethics complaint because it is against House rules to violate campaign finance laws.

Walden's staff directed comment to NRCC spokeswoman Andrea Bozek, who said in a statement:

"This is nothing more than a publicity stunt by an extreme liberal front group for Democrats to bolster their deflated supporters after the Democrats’ defeat in yesterday’s special election.”

CREW says it is focused on promoting ethics and accountability in government. It has received funding from some prominent liberal sources and its annual report on corruption in Congress has tended to feature more Republicans than Democrats.